EP1590942B1 - Uplink transmission power control method - Google Patents

Uplink transmission power control method Download PDF

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Publication number
EP1590942B1
EP1590942B1 EP04708082A EP04708082A EP1590942B1 EP 1590942 B1 EP1590942 B1 EP 1590942B1 EP 04708082 A EP04708082 A EP 04708082A EP 04708082 A EP04708082 A EP 04708082A EP 1590942 B1 EP1590942 B1 EP 1590942B1
Authority
EP
European Patent Office
Prior art keywords
transmission power
uplink transmission
command value
command
power control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04708082A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1590942A2 (en
Inventor
Joon Kui 108-1505 Gwanak Hyundai Apt. AHN
Bong Hoe c/o LG Institute KIM
Seung Hoon 102-1501 Seocho Samsung Remian HWANG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020030006913A external-priority patent/KR100976463B1/ko
Priority claimed from KR1020030007546A external-priority patent/KR100983262B1/ko
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP1590942A2 publication Critical patent/EP1590942A2/en
Application granted granted Critical
Publication of EP1590942B1 publication Critical patent/EP1590942B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control

Definitions

  • the present invention relates to a power control method applied to mobile communication, and more particularly, to an uplink transmission power control method.
  • uplink transmission power control in mobile communication system is essential to enhancement of system reception capacity and efficient terminal power use.
  • An uplink transmission power control method according to a related art is explained as follows.
  • a base station receives an uplink transmission signal transmitted from a terminal, and decides whether to have the terminal raise/lower its uplink transmission power according to the transmitted signal. The base station then transmits a transmission power control command to the terminal according to the decision.
  • the terminal receives the transmission power control commands transmitted from the base station (node-B), and determines the uplink transmission power according to the power control commands. The terminal then performs uplink transmission according to a result of the determination to accomplish the uplink transmission power control.
  • the uplink transmission power control method is explained in detail as follows.
  • a terminal receives transmission power control commands transmitted from one base station. In case that the entire power control commands received for a predetermined continuous time slot indicate 'transmission power increase', the terminal decides to raise uplink transmission power.
  • the terminal decides to lower the uplink transmission power.
  • the terminal determines to maintain the transmission power. And, the terminal lowers, raises, or maintains the uplink transmission power according to a result of the determination.
  • a method of controlling transmission power by determining one of three states including increase/decrease/maintain is called a 3-states power control method.
  • US 5,815,798 describes an uplink transmission power control method, wherein a subscriber terminal receives a power control signal, which is transmitted from a central base station.
  • the uplink transmission power is lowered if the received power control command includes power reduction command.
  • the present invention is directed to an uplink transmission power control method that substantially obviates one or more problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide an uplink transmission power control method, by which a transmission power of an uplink signal is efficiently controlled while a terminal communicates with a plurality of base stations.
  • an uplink transmission power control method comprising: computing command values for a plurality of base stations in a terminal in soft handover with a plurality of the base stations transmitting power control commands to the terminal; and lowering uplink transmission power if the command values computed for a plurality of the base stations includes at least one power-down command.
  • an uplink transmission power control method comprising receiving power control commands transmitted from a plurality of base stations; computing at least one command value according to the received power control commands, lowering uplink transmission power if any of the command value computed as a transmission power-down command value, computing an average of the command value if there isn't the command value computed as the transmission power-down command value and comparing the average of the command value to a reference value and raising or maintaining the uplink transmission power according to a result of the comparing.
  • the present invention lowers the uplink transmission power of the terminal to use the power of the terminal efficiently and to operate the base stations stably.
  • the terminal receives power control commands from at least one or more base stations and should determine uplink transmission power according to the received commands.
  • FIG. 2 is a flowchart of a method of controlling uplink transmission power in soft handover in accordance with control commands received from a plurality of base stations according to one embodiment of the present invention.
  • uplink transmission power of a terminal in soft handover is controlled in a following manner.
  • each base station transmits an independent transmission power control command.
  • the transmission power control command transmitted from one base station may be different from power control commands transmitted from other base stations. Namely, a base station A keeps transmitting the transmission power increase commands for a predetermined time slot, whereas a base station B keeps transmitting the transmission power decrease commands for the time slot.
  • the power in transmitting next uplink signals is then raised, lowered, or maintained (S26).
  • FIG. 3 is a flowchart of a method of controlling an uplink power in soft handover in accordance with control commands received from a plurality of base stations according to another embodiment of the present invention.
  • each base station receives an uplink signal transmitted from a terminal connected to the corresponding base station, and transmits a power control command determined according to a quality of the received uplink signal to the terminal (S31).
  • the quality of the signal which was transmitted from the terminal and received by the respective base stations, may differ from each other since channel environments between the terminal and the respective base stations may differ from each other.
  • the power control commands transmitted from the respective base stations to the terminal may differ from each other.
  • each of the base stations independently transmits the transmission power control command, which is determined according to the separately received uplink signal quality information, to the terminal. In doing so, each of the base stations transmits the power control command to the terminal each time slot.
  • a command value computing unit included in the terminal then computes a command value TPC tempi using the power control commands transmitted from the respective base stations for predetermined time slots (S32).
  • each five time slots can be grouped by taking a first time slot of each radio frame as a reference. Namely, as one radio frame consists of fifteen time slots, the power control command values can be computed by dividing the radio frame by five time slots unit from the first time slot.
  • the average of the power command values is found (S35). And, the found average is compared to the predetermined reference value to determine uplink transmission power (S36). In accordance with the determined transmission power, the uplink signal is transmitted (S37).
  • the terminal finds an average of power adjustment values of a plurality of the base stations using Equation 1 or 2 (S33), and compares the average to the reference value (S34).
  • Equation 1 or 2 'N' indicates the number of the base stations, 'i' is an integer increasing 1 to N, TPC tempi represents the command value corresponding to an i th base station, and ' ⁇ ' is a predetermined constant as a reference value for power control.
  • a power control command transmitted from an arbitrary base station can be expressed by three kinds of command values such as '0' for transmission power maintain, '1' for transmission power increase, and '-1' for transmission power decrease.
  • the average of the command values can be computed as '0', '1', or a decimal fraction smaller than 1.
  • the terminal in case that the terminal is communicating with a plurality of the base stations in soft handover, successful communication is possible if an uplink communication quality is met for one of the base stations.
  • the reference value ⁇ can be appropriately selected according to how to set up an increase frequency of the terminal transmission power. For instance, it frequently happens that the transmission power needs to be raised, as the reference value gets smaller. Yet, as the reference value gets smaller, the case that the transmission power needs to be raised is reduced. Thus, by adjusting the increase frequency that raises the uplink transmission power of the terminal, the average power received by the base station(s) can be controlled.
  • the reference value is set to 0, 0.5, 1, etc. to operate the terminal using the 3-states power control method. Namely, if the entire command values indicate 'increase', the transmission power is raised. Yet, if the 'increase' command and the 'maintain' command simultaneously exist, the uplink power is controlled by changing the reference value in a manner that an operator of a terminal or a communication system providing a communication service to the terminal performs the power control with a certain degree of reliability of the power command value of the 'maintain'.
  • the operator of the terminal or communication system intends to perform the power control with the low reliability of the 'maintain' power command value. Namely, if the 'increase' command from at least one base station exists among the power control commands transmitted from a plurality of the base stations, it is controlled to raise the uplink transmission power.
  • the operator of the terminal or communication system intends to perform the power control with the relatively high reliability of the 'maintain' power command value. Namely, if the commands transmitted from a plurality of the base stations are 'increase' only, it is controlled to raise the uplink transmission power.
  • the average value is calculated by Equation 1, for example, to be compared to the reference value '0.5'.
  • the 'transmission power increase (up)' is determined only if the average value is greater than the reference value '0.5'.
  • the 'transmission power maintain' is determined if the average value is equal to or smaller than the reference value '0.5'.
  • the average value is calculated by Equation 1, for example, to be compared to the reference value '1'.
  • the 'transmission power increase (up)' is determined only if the average value is equal to or greater than the reference value '1'.
  • the 'transmission power maintain' is determined if the average value is smaller than the reference value '1'.
  • the uplink transmission power is lowered.
  • the transmission power can be lowered as well as the communication quality of a desirable level is maintained, whereby efficient transmission power control can be achieved.
  • averaged reception power of the corresponding base station can be controlled by setting up the reference value appropriately to adjust the increase frequency of the transmission power.
  • FIG. 4 is a flowchart of a method of controlling an uplink power in soft handover in accordance with control commands received from a plurality of base stations according to a further embodiment of the present invention.
  • each base station receives an uplink signal transmitted from a terminal connected to the corresponding base station, and transmits a power control command determined according to a quality of the received uplink signal to the terminal (S41).
  • each of the base stations independently transmits the transmission power control command, which is determined according to the separately received uplink signal quality information, to the terminal. In doing so, each of the base stations transmits the power control command to the terminal each time slot.
  • a command value computing unit included in the terminal then computes a command value TPC_temp i using the power control commands transmitted from the respective base stations for predetermined time slots (S42).
  • the command value TPC_temp i can be calculated by regarding five time slots as one unit.
  • each five time slots can be grouped by taking a first time slot of each radio frame as a reference.
  • the uplink transmission power can be determined using the command received from each base station without setting up the reference value. Namely, if at least one of the command values (TPC_temp i ) determined according to the power control commands transmitted from a plurality of the base stations is the 'transmission power decrease (-1)', it is determined to lower the transmission power. Meanwhile, if the entire command values determined according to the power control commands transmitted from the respective base stations are 'transmission power increase (1)', it is determined to raise the transmission power. Otherwise, it is determined to maintain the transmission power as it is.
  • Table 3 shows a method of determining uplink transmission power according to the above-explained method.
  • FIG. 5 is a block diagram of a terminal for controlling a transmission power of an uplink signal according to a preferred embodiment of the present invention.
  • a terminal 50 includes a receiving unit 51, a command value computing unit 52, a transmission power determining unit 53, and a transmitting unit 54.
  • the receiving unit 51 receives power control commands from at least one or more base stations.
  • the command value computing unit 52 computes command values (TPC_temp i ) according to the power control commands received from the respective base stations. Namely, the command values (TPC_temp i ) are computed according to the power control commands received from the respective base stations for a time slot having a predetermined length.
  • the transmission power determining unit 53 finds an average of adjustment values, and compares the average to reference values to determine whether to raise, lower, or maintain uplink transmission power.
  • the transmitting unit 54 raises, lowers, or maintains the uplink transmission power according to a determination result of the transmission power determining unit 53.
  • the present invention lowers the uplink transmission power of the terminal to use the power of the terminal efficiently and to operate the base stations stably.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Transmitters (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
EP04708082A 2003-02-04 2004-02-04 Uplink transmission power control method Expired - Lifetime EP1590942B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
KR1020030006913A KR100976463B1 (ko) 2003-02-04 2003-02-04 상향 링크 신호의 전송 전력을 제어하는 방법 및 이를위한 통신 단말기
KR2003006913 2003-02-04
KR1020030007546A KR100983262B1 (ko) 2003-02-06 2003-02-06 상향 링크 신호의 전송 전력을 제어하는 방법
KR2003007546 2003-02-06
PCT/KR2004/000203 WO2004070957A2 (en) 2003-02-04 2004-02-04 Uplink transmission power control method

Publications (2)

Publication Number Publication Date
EP1590942A2 EP1590942A2 (en) 2005-11-02
EP1590942B1 true EP1590942B1 (en) 2008-10-08

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EP04708082A Expired - Lifetime EP1590942B1 (en) 2003-02-04 2004-02-04 Uplink transmission power control method

Country Status (12)

Country Link
US (1) US7340269B2 (uk)
EP (1) EP1590942B1 (uk)
JP (1) JP4528765B2 (uk)
AT (1) ATE410877T1 (uk)
AU (1) AU2004209244B2 (uk)
DE (1) DE602004016957D1 (uk)
ES (1) ES2312960T3 (uk)
HK (1) HK1087282A1 (uk)
MX (1) MXPA05008263A (uk)
RU (1) RU2332797C2 (uk)
UA (1) UA83653C2 (uk)
WO (1) WO2004070957A2 (uk)

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IL170925A (en) * 2005-09-18 2010-12-30 Alvarion Ltd Method and device for transmission power control in wireless communications networks
CN101114851B (zh) * 2006-07-24 2010-10-20 大唐移动通信设备有限公司 一种hsdpa的功率控制方法及装置
JP4882775B2 (ja) * 2007-02-09 2012-02-22 富士通株式会社 無線端末の通信制御方法及び無線端末
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KR101487457B1 (ko) * 2008-06-30 2015-02-06 삼성전자주식회사 이동통신 시스템에서 핸드오버 메시지 송신 전력 제어 방법및 장치
CN101860950B (zh) * 2009-04-10 2012-11-14 电信科学技术研究院 一种多载波用户终端的功率控制方法和系统
CN102208967B (zh) 2010-03-31 2014-04-09 中兴通讯股份有限公司 一种lte终端非自适应重传功率控制的方法及装置
US8582518B2 (en) 2010-11-09 2013-11-12 Telefonaktiebolaget L M Ericsson (Publ) Power control for ACK/NACK formats with carrier aggregation
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CN102300304B (zh) * 2011-09-20 2016-04-06 电信科学技术研究院 一种上行功控的实现方法及装置

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Also Published As

Publication number Publication date
UA83653C2 (uk) 2008-08-11
HK1087282A1 (en) 2006-10-06
MXPA05008263A (es) 2005-09-20
AU2004209244A1 (en) 2004-08-19
WO2004070957A3 (en) 2004-11-11
JP4528765B2 (ja) 2010-08-18
AU2004209244B2 (en) 2009-02-26
RU2005127632A (ru) 2006-01-27
EP1590942A2 (en) 2005-11-02
US7340269B2 (en) 2008-03-04
WO2004070957A2 (en) 2004-08-19
ES2312960T3 (es) 2009-03-01
RU2332797C2 (ru) 2008-08-27
ATE410877T1 (de) 2008-10-15
JP2006516861A (ja) 2006-07-06
DE602004016957D1 (de) 2008-11-20
US20040166888A1 (en) 2004-08-26

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